#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>

int main() {
    char a;

    while ((a=getchar())!=EOF){

        if (a != '\n') 
        {if ((a >=65 && a <= 90) || (a >= 97 && a <= 123))
            printf("%c is an alphabet.\n", a);
        else
            printf("%c is not an alphabet.\n", a);
        getchar();
        }
        
    } 

    return 0;
}